Abstract: There are provided a Schmitt trigger circuit that has hysteresis characteristics in which a release point and an operating point are determined based on a width of an inputted pulse.

Abstract: There is provided a Hall sensor for canceling an offset, including: a Hall element unit including at least one pair of Hall elements, each having a preset detection direction, and connecting detection terminals of the pair of Hall elements to different paths according to a preset calibration mode and a preset operation mode; and a calibration unit calibrating an offset of a detection voltage in the operation mode of the Hall element unit according to an detection voltage in the calibration mode of the Hall element unit.

Abstract: There are provided a hall sensor having an offset removal function removing an offset included in a hall voltage, and an offset removing method thereof. The hall sensor includes: a converting unit converting first and second detection voltages detected for each of a plurality of preset detection directions by a hall device detecting a magnetic field as a voltage according to the plurality of preset detection directions into a pulse having a level difference therebetween as a width; a sign determining unit comparing the first and second detection voltages with each other and determining whether the pulse has a positive sign or a negative sign according to the comparison result; a counter counting the width of the pulse from the converting unit with a preset reference time unit; and an operating unit removing an offset voltage included in the first and second detection voltages by performing a minus operation with the numbers counted by the counter according to the sign determined by the sign determining unit.

Abstract: A Hall integrated circuit with adjustable hysteresis is disclosed. The circuit in accordance with an embodiment of the present invention includes a magnetic field-pulse convertor, which outputs a pulse-shaped voltage difference pulse by converting a change in two voltages as a pulse and in which the change occurs in accordance with a magnitude of a magnetic field inputted by a Hall sensor, a polarity determining unit, which determines polarities of two signals outputted by the Hall sensor by using the voltage difference pulse and one of the two signals outputted by the Hall sensor, a magnetic flux density determining unit, which outputs a high signal or a low signal by comparing the voltage difference pulse with a set value, and a first flip-flop outputs a result signal having a hysteresis characteristic according to inputs by the polarity determining unit and the magnetic flux density determining unit.

Abstract: There is provided a current circuit having a selective temperature coefficient. The current circuit may include: a first current generating unit generating a first current having a positive temperature characteristic which increases depending on temperature; a second current generating unit generating a second current having a negative temperature characteristic which decreases depending on temperature; a multiplying unit multiplying and outputting each of the first current and the second current; and a switching unit selectively synthesizing and outputting a plurality of currents outputted from the multiplying unit depending on on/off control signals. Therefore, it is possible to prevent performance from being deteriorated by temperature and easily and efficiently adjust a temperature coefficient through a simple switching logic.

Abstract: There is provided a hall integrated circuit using a rectifier circuit including: a hall device receiving a power supply voltage for excitation and outputting a hall voltage which is in proportion to the intensity of an applied magnetic field; an amplifier amplifying the hall voltage; and a rectifying unit rectifying the amplified hall voltage to improve sensitivity and modify for user convenience by ensuring a high headroom at even a low power supply voltage.

Abstract: There is provided a hall device module equipped with interconnected double hall devices.

Abstract: There is provided an integrated apparatus for sensing current including: a voltage regulator; a Hall effect device receiving current by the voltage regulator and outputting hall voltage in proportional to strength of a magnetic field; and a coil having one end connected to a first connecting terminal and the other end connected to a second connecting terminal, wound to have a plurality of turns along a circumference of the Hall effect device on the same plane spaced apart by a predetermined distance from the Hall effect device in a direction of the magnetic field, and forming the magnetic field according to current flowing through the first connecting terminal and the second connecting terminal, wherein the Hall effect device and the coil are integrated within one chip. A manufacturing cost of a product may be reduced, simultaneously with sensing the current without loss of the magnetic field according to a distance through the above-mentioned configuration.

Abstract: A multiple frequency band hybrid receiver includes a plurality of input terminals to which different frequency band signals are respectively inputted; a plurality of mixers connected to the plurality of input terminals sequentially, receiving the different frequency band signals respectively, and down-converting frequencies of the received frequency band signals to predetermined frequencies; an output terminal outputting baseband signals. Each mixer receives a signal from an input terminal connected thereto or another mixer. One of the plurality of mixers receives the lowest frequency band signal, converts a frequency of the received signal to a baseband frequency, and provides a signal having the baseband frequency to the output terminal. The other mixers each down-convert a frequency of a received signal to a frequency band of a signal which is inputted into another mixer.

Abstract: There are provided a Schmitt trigger circuit that has hysteresis characteristics in which a release point and an operating point are determined based on a width of an inputted pulse.

Abstract: A Hall device includes: a main plate, formed as a first metal plate, including first and second terminals that can be selectively connected to a power source terminal, third and fourth terminals that can be selectively connected to a ground, fifth and sixth terminals that can be connected to first and third terminals, respectively, a first resistor disposed between the first and second terminals, a second resistor disposed between the fifth and sixth terminals, a third resistor disposed between the third and fourth terminals, and a fourth resistor disposed between the second and fourth terminals, all of which being formed on the first metal plate; and a first auxiliary plate, formed as a second metal plate adjacent to the first metal plate of the main plate, including first and second auxiliary terminals that can be connected to the first and third terminals, and a fifth resistor disposed between the first and second auxiliary terminals, all of which being formed on the second metal plate.

Abstract: A Hall integrated circuit with adjustable hysteresis is disclosed. The circuit in accordance with an embodiment of the present invention includes a magnetic field-pulse convertor, which outputs a pulse-shaped voltage difference pulse by converting a change in two voltages as a pulse and in which the change occurs in accordance with a magnitude of a magnetic field inputted by a Hall sensor, a polarity determining unit, which determines polarities of two signals outputted by the Hall sensor by using the voltage difference pulse and one of the two signals outputted by the Hall sensor, a magnetic flux density determining unit, which outputs a high signal or a low signal by comparing the voltage difference pulse with a set value, and a first flip-flop outputs a result signal having a hysteresis characteristic according to inputs by the polarity determining unit and the magnetic flux density determining unit.

Abstract: A multiple frequency band hybrid receiver includes a plurality of input terminals to which different frequency band signals are respectively inputted; a plurality of mixers connected to the plurality of input terminals sequentially, receiving the different frequency band signals respectively, and down-converting frequencies of the received frequency band signals to predetermined frequencies; an output terminal outputting baseband signals. Each mixer receives a signal from an input terminal connected thereto or another mixer. One of the plurality of mixers receives the lowest frequency band signal, converts a frequency of the received signal to a baseband frequency, and provides a signal having the baseband frequency to the output terminal. The other mixers each down-convert a frequency of a received signal to a frequency band of a signal which is inputted into another mixer.

Abstract: Provided is a reference current generating circuit capable of maintaining a constant output level regardless of a temperature variation by the use of a reference resistor having a constant resistance regardless of the temperature variation. The reference current generating circuit includes a reference voltage circuit supplying a reference voltage having a constant level regardless of a temperature variation, and a reference resistor circuit comprising a resistor having a positive temperature coefficient and a resistor having a negative temperature coefficient that are connected in series, the reference resistor circuit having a constant total resistance regardless of the temperature variation. Herein, a reference current having a constant level regardless of the temperature variation is generated by the reference voltage and the resistance of the reference resistor circuit.

Abstract: A balun transformer includes a first conductive pattern having one end provided as an input/output port of an unbalanced signal, a second conductive pattern electromagnetically coupled to the first conductive pattern and having both ends provided as input/output ports of a balanced signal, and a first variable capacitor connected between a ground part and a middle part of an electrical length of the second conductive pattern.

Abstract: Provided is a reference current generating circuit capable of maintaining a constant output level regardless of a temperature variation by the use of a reference resistor having a constant resistance regardless of the temperature variation. The reference current generating circuit includes a reference voltage circuit supplying a reference voltage having a constant level regardless of a temperature variation, and a reference resistor circuit comprising a resistor having a positive temperature coefficient and a resistor having a negative temperature coefficient that are connected in series, the reference resistor circuit having a constant total resistance regardless of the temperature variation. Herein, a reference current having a constant level regardless of the temperature variation is generated by the reference voltage and the resistance of the reference resistor circuit.

Abstract: A balun transformer includes a first conductive pattern having one end provided as an input/output port of an unbalanced signal, a second conductive pattern electromagnetically coupled to the first conductive pattern and having both ends provided as input/output ports of a balanced signal, and a first variable capacitor connected between a ground part and a middle part of an electrical length of the second conductive pattern.

Abstract: There is provided a spiral inductor including an insulation board formed into a flat-plate shape; a conductive pattern having a spiral shape and formed at least one surface of the insulation board, wherein the conductive pattern varies in line width according to a distance from one end of the conductive pattern forming a spiral.

Abstract: Provided is a low-power wireless communication apparatus and method. In the apparatus, a low-noise amplifier amplifies an RF signal in an on state, the low-noise amplifier be turned on/off according to a predetermined control signal. A wake-up signal detector detects a wake-up signal from the amplified RF signal. A controller provides the predetermined control signal such that the low-noise amplifier and the wake-up signal detector operate at a predetermined on-off duty ratio in a sleep mode corresponding to an Rx waiting state, and switching to an Rx mode to maintain the on state of the low-noise amplifier when the wake-up signal is detected.